役者 キム・ヒョンソク (音楽家), Jung Shin Hye, You Jin Lee, Choi Hee Seung, Im Hwe Jin, TREASURE (音楽グループ)

紹介: Things are turned upside down in the search for "M" when an anonymous confession is published on Seoyeon University's student forum. Coming from different departments of the university, the four students- Ma Joo Ah, Cha Min Ho, Seo Ji Min, and Park Ha Neul are in search for “M”. They go through university-life, changing friendships, and realistic budding romances in the course of their search.